All files / lib/internal/streams utils.js

96.2% Statements 279/290
88.62% Branches 148/167
100% Functions 22/22
96.2% Lines 279/290

Press n or j to go to the next uncovered block, b, p or k for the previous block.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 29125x 25x 25x 25x 25x 25x 25x 25x 25x 25x 25x 25x 25x 2959x 2959x 2959x 2959x 2959x 2905x 2905x 68x 2959x 2959x 2959x 2959x 2959x 25x 2247x 2247x 2247x 2247x 2247x 2247x 2247x 2247x 25x 19x 19x 19x 19x 19x 1x 19x 19x 25x 5778x 5778x 5778x 5777x 5777x 5777x 5777x 137x 5777x 5778x 5778x 25x 604x 604x 604x 604x 602x 604x 604x 25x 1083x 1083x 1082x 1082x 1083x 1083x 1083x 25x 25x 216x 216x 216x 216x 216x 216x 214x 216x 25x 25x 923x 923x 923x 606x 923x 923x 384x 384x 384x 923x 923x 25x 25x 14x 14x 14x 14x 14x 14x 12x 14x 25x 25x 1176x 1176x 1175x 1176x 1176x 1008x 1031x 1005x 1176x 1176x 25x 358x 358x 358x 338x 338x 358x 358x 358x 25x 689x 689x 689x 217x 689x 689x 689x 25x 84x 84x     84x 84x     84x 84x 77x 77x 7x 84x 4x 4x 4x 4x 84x 25x 831x 831x 2x 2x 831x 831x     829x 831x 831x 25x 697x 697x 2x 2x 697x 697x     697x 697x 697x 25x 894x 894x 1x 1x 893x 894x 856x 856x 892x 892x 892x 892x 892x 894x 37x 894x     37x 894x 22x 22x 15x 15x 894x 25x 34x 34x 34x 34x 34x 34x 34x 34x 25x 36x 36x 36x 12x 36x 36x 25x 139x 139x 139x 139x 4x 139x 139x 25x 894x 894x 893x 893x 893x 894x 894x 894x 881x 881x 881x 784x 894x 894x 25x 14x 14x 14x 8x 14x 14x 25x 9x 9x 9x 9x 9x 9x 9x 9x   9x 9x 25x 25x 25x 25x 25x 25x 25x 25x 25x 25x 25x 25x 25x 25x 25x 25x 25x 25x 25x 25x 25x 25x 25x 25x 25x 25x 25x 25x  
'use strict';
 
const {
  Symbol,
  SymbolAsyncIterator,
  SymbolIterator,
} = primordials;
 
const kDestroyed = Symbol('kDestroyed');
const kIsErrored = Symbol('kIsErrored');
const kIsReadable = Symbol('kIsReadable');
const kIsDisturbed = Symbol('kIsDisturbed');
 
function isReadableNodeStream(obj, strict = false) {
  return !!(
    obj &&
    typeof obj.pipe === 'function' &&
    typeof obj.on === 'function' &&
    (
      !strict ||
      (typeof obj.pause === 'function' && typeof obj.resume === 'function')
    ) &&
    (!obj._writableState || obj._readableState?.readable !== false) && // Duplex
    (!obj._writableState || obj._readableState) // Writable has .pipe.
  );
}
 
function isWritableNodeStream(obj) {
  return !!(
    obj &&
    typeof obj.write === 'function' &&
    typeof obj.on === 'function' &&
    (!obj._readableState || obj._writableState?.writable !== false) // Duplex
  );
}
 
function isDuplexNodeStream(obj) {
  return !!(
    obj &&
    (typeof obj.pipe === 'function' && obj._readableState) &&
    typeof obj.on === 'function' &&
    typeof obj.write === 'function'
  );
}
 
function isNodeStream(obj) {
  return (
    obj &&
    (
      obj._readableState ||
      obj._writableState ||
      (typeof obj.write === 'function' && typeof obj.on === 'function') ||
      (typeof obj.pipe === 'function' && typeof obj.on === 'function')
    )
  );
}
 
function isIterable(obj, isAsync) {
  if (obj == null) return false;
  if (isAsync === true) return typeof obj[SymbolAsyncIterator] === 'function';
  if (isAsync === false) return typeof obj[SymbolIterator] === 'function';
  return typeof obj[SymbolAsyncIterator] === 'function' ||
    typeof obj[SymbolIterator] === 'function';
}
 
function isDestroyed(stream) {
  if (!isNodeStream(stream)) return null;
  const wState = stream._writableState;
  const rState = stream._readableState;
  const state = wState || rState;
  return !!(stream.destroyed || stream[kDestroyed] || state?.destroyed);
}
 
// Have been end():d.
function isWritableEnded(stream) {
  if (!isWritableNodeStream(stream)) return null;
  if (stream.writableEnded === true) return true;
  const wState = stream._writableState;
  if (wState?.errored) return false;
  if (typeof wState?.ended !== 'boolean') return null;
  return wState.ended;
}
 
// Have emitted 'finish'.
function isWritableFinished(stream, strict) {
  if (!isWritableNodeStream(stream)) return null;
  if (stream.writableFinished === true) return true;
  const wState = stream._writableState;
  if (wState?.errored) return false;
  if (typeof wState?.finished !== 'boolean') return null;
  return !!(
    wState.finished ||
    (strict === false && wState.ended === true && wState.length === 0)
  );
}
 
// Have been push(null):d.
function isReadableEnded(stream) {
  if (!isReadableNodeStream(stream)) return null;
  if (stream.readableEnded === true) return true;
  const rState = stream._readableState;
  if (!rState || rState.errored) return false;
  if (typeof rState?.ended !== 'boolean') return null;
  return rState.ended;
}
 
// Have emitted 'end'.
function isReadableFinished(stream, strict) {
  if (!isReadableNodeStream(stream)) return null;
  const rState = stream._readableState;
  if (rState?.errored) return false;
  if (typeof rState?.endEmitted !== 'boolean') return null;
  return !!(
    rState.endEmitted ||
    (strict === false && rState.ended === true && rState.length === 0)
  );
}
 
function isReadable(stream) {
  if (stream && stream[kIsReadable] != null) return stream[kIsReadable];
  if (typeof stream?.readable !== 'boolean') return null;
  if (isDestroyed(stream)) return false;
  return isReadableNodeStream(stream) &&
    stream.readable &&
    !isReadableFinished(stream);
}
 
function isWritable(stream) {
  if (typeof stream?.writable !== 'boolean') return null;
  if (isDestroyed(stream)) return false;
  return isWritableNodeStream(stream) &&
    stream.writable &&
    !isWritableEnded(stream);
}
 
function isFinished(stream, opts) {
  if (!isNodeStream(stream)) {
    return null;
  }
 
  if (isDestroyed(stream)) {
    return true;
  }
 
  if (opts?.readable !== false && isReadable(stream)) {
    return false;
  }
 
  if (opts?.writable !== false && isWritable(stream)) {
    return false;
  }
 
  return true;
}
 
function isWritableErrored(stream) {
  if (!isNodeStream(stream)) {
    return null;
  }
 
  if (stream.writableErrored) {
    return stream.writableErrored;
  }
 
  return stream._writableState?.errored ?? null;
}
 
function isReadableErrored(stream) {
  if (!isNodeStream(stream)) {
    return null;
  }
 
  if (stream.readableErrored) {
    return stream.readableErrored;
  }
 
  return stream._readableState?.errored ?? null;
}
 
function isClosed(stream) {
  if (!isNodeStream(stream)) {
    return null;
  }
 
  if (typeof stream.closed === 'boolean') {
    return stream.closed;
  }
 
  const wState = stream._writableState;
  const rState = stream._readableState;
 
  if (
    typeof wState?.closed === 'boolean' ||
    typeof rState?.closed === 'boolean'
  ) {
    return wState?.closed || rState?.closed;
  }
 
  if (typeof stream._closed === 'boolean' && isOutgoingMessage(stream)) {
    return stream._closed;
  }
 
  return null;
}
 
function isOutgoingMessage(stream) {
  return (
    typeof stream._closed === 'boolean' &&
    typeof stream._defaultKeepAlive === 'boolean' &&
    typeof stream._removedConnection === 'boolean' &&
    typeof stream._removedContLen === 'boolean'
  );
}
 
function isServerResponse(stream) {
  return (
    typeof stream._sent100 === 'boolean' &&
    isOutgoingMessage(stream)
  );
}
 
function isServerRequest(stream) {
  return (
    typeof stream._consuming === 'boolean' &&
    typeof stream._dumped === 'boolean' &&
    stream.req?.upgradeOrConnect === undefined
  );
}
 
function willEmitClose(stream) {
  if (!isNodeStream(stream)) return null;
 
  const wState = stream._writableState;
  const rState = stream._readableState;
  const state = wState || rState;
 
  return (!state && isServerResponse(stream)) || !!(
    state &&
    state.autoDestroy &&
    state.emitClose &&
    state.closed === false
  );
}
 
function isDisturbed(stream) {
  return !!(stream && (
    stream[kIsDisturbed] ??
    (stream.readableDidRead || stream.readableAborted)
  ));
}
 
function isErrored(stream) {
  return !!(stream && (
    stream[kIsErrored] ??
    stream.readableErrored ??
    stream.writableErrored ??
    stream._readableState?.errorEmitted ??
    stream._writableState?.errorEmitted ??
    stream._readableState?.errored ??
    stream._writableState?.errored
  ));
}
 
module.exports = {
  kDestroyed,
  isDisturbed,
  kIsDisturbed,
  isErrored,
  kIsErrored,
  isReadable,
  kIsReadable,
  isClosed,
  isDestroyed,
  isDuplexNodeStream,
  isFinished,
  isIterable,
  isReadableNodeStream,
  isReadableEnded,
  isReadableFinished,
  isReadableErrored,
  isNodeStream,
  isWritable,
  isWritableNodeStream,
  isWritableEnded,
  isWritableFinished,
  isWritableErrored,
  isServerRequest,
  isServerResponse,
  willEmitClose,
};